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Measuring Crustal Lg-Waves Attenuation in the Northern Part of Africa

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DOI: 10.4236/ojer.2016.52008    2,972 Downloads   3,458 Views Citations

ABSTRACT

Lg-waves propagate over long distances in the northern part of Africa and are recorded on the seismic station located close to Abeche (Chad). We have applied the well-known coda analysis method developed by Aki and Chouet [1] to study the Lg-wave anelastic attenuation in this area. We found a frequency dependence: Q( f ) = (650±34) f (0.77±0.2). This result shows an average value of Q0 (Q0 ≈ 650) for earthquakes occurred in tectonic areas as the East African Rift system, Turkey, Greece and Red Sea. The higher value of Q0 (Q0 ≈ 800) is obtained for the event occurred in the middle of the stable plate close to the Tamanrasset (TAM) station in Algeria.

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Issak, A. and Camerlynck, C. (2016) Measuring Crustal Lg-Waves Attenuation in the Northern Part of Africa. Open Journal of Earthquake Research, 5, 105-113. doi: 10.4236/ojer.2016.52008.

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